APA (7th ed.) Zitazioa

(1999). Purchasing power parities and real expenditures (1999 edition.). OECD.

Chicago Style (17th ed.) Zitazioa

Purchasing Power Parities and Real Expenditures. 1999 edition. Paris, Cedex, France: OECD, 1999.

MLA (9th ed.) Zitazioa

Purchasing Power Parities and Real Expenditures. 1999 edition. OECD, 1999.